HYDAC solutions for hydraulic accumulator pressure monitoring
1/7 HYDAC p₀‑Guard – EDS 3400
The EDS 3400 enables the accumulator pre-charge pressure (p0) to be monitored and the accumulator charging function to be controlled. The accumulator's pre-charge pressure is monitored on the fluid side during each shutdown process (when the fluid side of the accumulator is discharged).
• Easy to install into the hydraulic system
• System monitoring with one guard device
• Signal output when the pre-charge pressure (p₀) is too low
• Integrated accumulator charging function
• Predictive maintenance
2/7 HYDAC bladder integrity system - BIS
The BIS operates on the gas side of the bladder accumulator. It detects when fluid has entered the bladder and triggers a signal. This makes it possible to detect bladder breakage. Temperature and pressure can also be recorded via electronics (current loop/HART).
• Detection of a defective bladder minimises downtimes
• Increased process reliability due to continuous p₀ monitoring at the accumulator
• Accumulator bladder changes can be planned in advance
• Optimised monitoring of the entire system through signal processing and error analysis
3/7 HYDAC piston position monitoring - Laser
The laser linear position measurement system optically monitors the piston position and is mounted on the gas side. Its functional principle is based on elapsed time measurement. This involves the laser beam reaching the piston, being deflected and then being detected by the sensor. The position of the piston in the piston accumulator is calculated on the basis of the time the laser beam takes to complete its journey.
• Compact design and non-contact measuring system
• Continuous measurement signal across the entire piston stroke
• Exchange and calibration is possible in an operational state. No nitrogen discharging is required
4/7 HYDAC piston position monitoring - HLT
The HLT is a linear, magnetostrictive position measurement system. Its functional principle is based on elapsed time measurement of current and torsion pulses which are exchanged inductively without contact between the measuring point (= piston position) and the electronics.
• Continuous measurement signal across the entire piston stroke
• Compact design
• Central installation (oil or gas side)
• Ability to connect to all standard measurement systems and control systems (e.g. PLC controls)
• Also available as a redundant system (SIL2/PLD2)
5/7 HYDAC piston position monitoring - HYDAC magnetic flap indication
With magnetic flap indication, the position of a piston is displayed with red/white flaps which are visible externally. Additional components can also be added (e.g. components which control system parts, transducers, switches).
• Continuous measurement on the gas side
• Visual indicator
6/7 HYDAC piston position monitoring - UP switch
Piston position switches detect the position of a piston in a piston accumulator through the wall of the cylindrical jacket. The piston position switch can be retrofitted with a clamp without requiring any further modification to the piston accumulator. The measurement principle is based on the ultrasonic pulse echo method.
• Easy retrofitting onto piston accumulators
• Available in a standard model and a model suitable for highly viscous fluids
7/7 HYDAC piston position monitoring - Other monitoring systems
HYDAC also offers other systems for monitoring the piston position, e.g. piston accumulators with a cable tension measurement system or a limit switch. Please contact us for further information or for a no-obligation, personalised consultation.